CCDA 640-864 Q&As – Data Center Design (1-5)

February 4, 2012

Section 4 – Data Center Design

Which of these statements is true concerning the data center access layer design?
A.    The access layer in the data center is typically built at Layer 3, which allows for better shaping of services across multiple servers.
B.    With Layer 2 access, the default gateway for the servers can be configured at the access or aggregation layer.
C.    A dual-homing NIC requires a VLAN or trunk between the two access switches to support the dual IP address on the two server links to two separate switches.
D.    The access layer is normally not required, as dual homing is standard from the servers to the aggregation layer.
Answer: B

Explanation: With Layer 2 / 3, capabilities in-built access layer switches can have data & voice VLANs with interfaces; this is helpful in improving routing convergence.
Link: bf.pdf

Which two statements about designing the Data Center Access layer are correct? (Choose two)
A.    Multiport NIC servers should each have their own IP address
B.    Layer 3 connectivity should never be used in the access layer
C.    Layer 2 connectivity is primarily implemented in the access layer
D.    Multiport NIC servers should never be used in the access layer
E.    Layer 2 clustering implementation requires servers to be Layer 2 adjacent
Answer: CE
Explanation: User access is primarily layer 2 in nature, layer 2 clustering is possible only in layer Here is the explanation from the Cisco press CCDA certification guide Figure 4-8. Enterprise Data Center Infrastructure Overview

Defining the DC Access Layer
The data center access layer’s main purpose is to provide Layer 2 and Layer 3 physical port density for various servers in the data center. In addition, data center access layer switches
provide high-performance, low-latency switching and can support a mix of oversubscription requirements. Both Layer 2 and Layer 3 access (also called routed access) designs are available, but most data center access layers are built using Layer 2 connectivity. The Layer 2 access design uses VLAN trunks upstream, which allows data center aggregation services to be shared across the same VLAN and across multiple switches. Other advantages of Layer 2 access are support for NIC teaming and server clustering that requires network connections to be Layer 2 adjacent or on the same VLAN with one another.
CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 4

Which one of these statements is true concerning the enterprise data center?
A.    It can be located either at the enterprise campus or at a remote branch.
B.    Remote data center connectivity requirements align with the small office design.
C.    The data center designs will differ substantially depending on whether the location is on campus or remote.
D.    A remote branch with a data center becomes the enterprise campus.
Answer: C
Explanation: If data center is at enterprise campus there will be no need for installing high capacity WAN links, just an upgrade if existing WAN infrastructure can accommodate increased traffic demands. There are many more such considerations while designing data centers.

Which two statements about the data Center Aggregation layer are correct? (Choose two)
A.    Layer 4 through layer 7 services are provided in that layer
B.    STP should never be supported in that layer
C.    That layer is the critical point for control and application services
D.    Layer 2 connectivity is provided in that layer from the data center to the core
Answer: AC
Explanation: Data Center aggregation layer connects various network modules together. Link:

What are three valid methods of gathering information about an existing data network? (Choose three.)
A.    Use organizational input.
B.    Analyze the user-mapping of a running application.
C.    Perform a traffic analysis.
D.    Perform a packet-level audit to verify carrier service guarantees.
E.    Use reports that analyze the metrics of the customer’s existing network.
F.    Perform a network audit to gather more detail about the network.
Answer: ACF

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